data_global
_chemical_name_mineral 'Fluoro-richterite'
loop_
_publ_author_name
'Cameron M'
'Sueno S'
'Papike J J'
'Prewitt C T'
_journal_name_full 'American Mineralogist'
_journal_volume 68 
_journal_year 1983
_journal_page_first 924
_journal_page_last 943
_publ_section_title
;
 High temperature crystal chemistry of K and Na fluor-richterites
 Note: sample Na, T = 24 C
;
_database_code_amcsd 0000912
_chemical_formula_sum 'Si8 Mg5 (Na2 Ca2) K4 O22 F2'
_cell_length_a 9.938
_cell_length_b 17.952
_cell_length_c 5.258
_cell_angle_alpha 90
_cell_angle_beta 106.62
_cell_angle_gamma 90
_cell_volume 898.874
_exptl_crystal_density_diffrn      3.764
_symmetry_space_group_name_H-M 'I 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  'x,-y,z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,1/2-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Si1   0.28130   0.91562   0.98598
Si2   0.28754   0.82886   0.48628
Mg1   0.00000   0.91115   0.50000
Mg2   0.00000   0.82120   0.00000
Mg3   0.00000   0.00000   0.00000
Na   0.00000   0.72433   0.50000
Ca   0.00000   0.72433   0.50000
K   0.47562   0.98685   0.53654
O1   0.11320   0.91574   0.89514
O2   0.11883   0.83236   0.39223
F3   0.10306   0.00000   0.39104
O4   0.36130   0.75099   0.56777
O5   0.34921   0.86942   0.25850
O6   0.34478   0.88307   0.75618
O7   0.34356   0.00000   0.05400
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Si1 0.00535 0.00478 0.00516 0.00033 0.00164 0.00007
Si2 0.00538 0.00567 0.00503 0.00083 0.00142 0.00021
Mg1 0.00713 0.00607 0.00627 0.00000 0.00233 0.00000
Mg2 0.00728 0.00717 0.00758 0.00000 0.00159 0.00000
Mg3 0.00720 0.00504 0.00580 0.00000 0.00231 0.00000
Na 0.01564 0.00996 0.00821 0.00000 -0.00156 0.00000
Ca 0.01564 0.00996 0.00821 0.00000 -0.00156 0.00000
K 0.05363 0.03793 0.02977 -0.01938 -0.02058 0.00461
O1 0.00614 0.00651 0.00792 -0.00008 0.00167 0.00013
O2 0.00689 0.00901 0.00664 0.00023 0.00172 -0.00129
F3 0.01049 0.00828 0.00763 0.00000 0.00086 0.00000
O4 0.01229 0.00878 0.00903 0.00378 0.00311 0.00121
O5 0.00822 0.01174 0.00873 0.00006 0.00249 0.00353
O6 0.01011 0.01123 0.00814 -0.00065 0.00347 -0.00373
O7 0.00951 0.00524 0.01249 0.00000 0.00136 0.00000